When allocate HTT descriptor, instead of allocating
large single chunk of memory, allocate small sized multiple
chunk of memory. Then not need to allocate order 5 memory.
Will have less chance to have memory alloc fail problem.
HTT descriptor. Frag descriptor. OL descriptor. TSO descriptor
Change-Id: Ib9d4a3f10adbc0656e1418cf3a67429322bb7164
CRs-fixed: 845666